Tries ::soundio_connect_backend on all available backends in order.
Possible errors:
* #SoundIoErrorInvalid - already connected
* #SoundIoErrorNoMem
* #SoundIoErrorSystemResources
* #SoundIoErrorNoSuchClient - when JACK returns JackNoSuchClient
See also ::soundio_disconnect
Tries ::soundio_connect_backend on all available backends in order. Possible errors: * #SoundIoErrorInvalid - already connected * #SoundIoErrorNoMem * #SoundIoErrorSystemResources * #SoundIoErrorNoSuchClient - when JACK returns JackNoSuchClient See also ::soundio_disconnect